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Yamaha MX & Off-Road Dirt Bikes
Yamaha Powervavle Pictures
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[QUOTE="damac, post: 1193526, member: 73693"] im still glad i came across this thread since i have an 89 yz 250 to service. i got this thing from a guy on craigslist for cheap but im trying to maintain it. i had not even looked over this bike much because it has ran like a tank, and im having a major issue every damn time i run the 125 and have learned not to touch things if you don't have to :) anyways for those that care the 89 125 and 250 do not share the same power valve parts and if you look at the oem parts list they aren't even designed the same way! on the 125 there is no pin in the cover and no tab on the power valve. the cover just seats on the left side into the circular groove on the power valve end. this makes me wonder though, on each bike, what is actually allowing the power valve assembly to be rotated too far to begin with? during normal operation should that ever happen even if you have the throttle pinned? i dont get why the 250 would have that safety stop and not the 125. on mine i guess if something happened on the governor side like slack or breakage, there would be nothing at that point from stopping the power valve from freely spinning. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Yamaha Powervavle Pictures
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